WInDVD and PowerDVD are pretty much the only ones worth mentioning.
They both cost the same, but IMHO, PowerDVD runs better.
Which package do you have now?
Oh, and heres a hint: If you have Windvd2000 or PowerDVD versions 3.x, they *should* run on an XP clean install, but people seem to have problem running them on upgrades when they were installed on the former OS.
My advice, is to clean install ALWAYS! Theres too many things that can go wrong on an upgrade.
I know, that doesnt help you right now. Sorry I dont have any workarounds with this, but maybe someone else might have another solution for you..
For what its worth, I hoped this helps you a little.